Dinoflagellate contributions to the deep sea
Dinoflagellate contributions to the deep sea
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DOI：
10.1575/1912/410
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
B. Dale;A. Dale
中科院分区：
文献类型：
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作者：
B. Dale;A. Dale
首次对深海不同深度的沉积物捕获器样本进行了分析，以估计鞭毛藻对深海沉积物通量贡献的矿物类型和数量。鞭毛藻运动阶段的岩屑几乎完全局限于水柱的上几百米，这支持了化石记录中没有它们的普遍接受的解释（即，岩屑由纤维素物质组成，在它们被纳入底部沉积物之前就被破坏了）。沉积物通量的主要贡献是由静止的囊体组成，这些囊体通常是在一些比较不知名的海洋鞭毛藻的生命周期中产生的，可能是Scrippsiella或Ensiculifera的物种。目前从浮游生物中沉积出来的囊状组合绝大多数是少数小的钙质类型（高达数千个/m2/天）。如果不溶解，这些可能会在底部沉积物中积累大量的古生物学意义上的重要数量，从而提供最具代表性的海洋鞭毛藻化石记录。孢粉学家先前描述的来自近期深海沉积物的“海洋组合”——有机壁囊肿可能代表来自更多沿海地区的长途运输，而不是海洋鞭毛藻的产生。
For the first time, sediment trap samples from several depths in the deep sea were analyzed to estimate both the types and amounts of mineral contributed by dinoflagellates to the deep sea sediment flux. Thecal remains of dinoflagellate motile stages were almost entirely restricted to the upper few hundred meters of the water column, supporting the generally accepted explanation of their absence in the fossil reord (I.e., theca are composed of cellulosic material which is destroyed before they may be incorporated into bottom sediments). The main contribution to the sediment flux is composed of resting cysts routinely produced in the life cycles of just a few of the more obscure oceanic dinoflagellates, probably species of Scrippsiella or Ensiculifera. The cyst assemblage sedimenting out from plankton at present is overwhelmingly dominated by a few small calcareous types (up to several thousands/m2/day). If not dissolved, these may accumulate in paleontologically significant amounts in bottom sediments to give the most representative fossil record oj' oceanic dinoflagellates. "Oceanic assemblages" oj' organic-walled cysts from Recent deep-sea sediments previously described by palynologists probably represent long distance transport from more coastal regions rather than oceanic dinoflagellate production.